You've probably already seen the Wiki pages, but in case you haven't here are a couple:
https://en.wikipedia.org/wiki/Formul...ocup#Champions
https://en.wikipedia.org/wiki/List_o..._2.0_champions
https://en.wikipedia.org/wiki/Formula_Renault#Winners
Plenty of the drivers have their own Wiki pages, as well as plenty of the individual seasons giving more depth.
Also, those pages, especially the last one, has plenty of other links within it to the series outside of Europe.